1-5Then the system automatically synchronizes the configurations to the device with the smallest unitID and changes the fabric name.With the above operations completed, the device can be added to the fabric and work normally.z You need to enable the XRN automatic fabric function on all the devices including the candidateswitch in the fabric to enable the candidate switch to download software and discovery neighborsand thus be added to the fabric normally.z If the candidate switch is going to download software from a unit in an XRN fabric, you arerecommended to set the ID of the unit to 1 to make the candidate switch download the software ofcorrect version.How XRN WorksWhen a fabric is established, the devices determine their respective roles in the fabric by comparingtheir CPU MAC addresses. The device with the lowest CPU MAC address is elected as the master andthe other devices are slaves.After the election, the fabric can operate normally. The following three functions of XRN can providesimple configuration mode, enhanced network performance and perfect redundancy backupmechanism for users.DDMDDM is a new device management mode provided by XRN. In normal cases, a fabric can be consideredas a single device. You can manage the entire fabric by logging onto any device in the fabric withdifferent logging modes. The devices in the fabric synchronize their configurations by exchangingpackets, thus ensuring stability of the fabric.FTM program uses Unit ID, or device ID to distinguish between the devices in a fabric when youmanage them. On initialization of the XRN function, each device considers its Unit ID as 1 and after afabric connection is established, the FTM program automatically re-numbers the devices or you canmanually configure the Unit ID of them.The master in a fabric collects the newest configurations of the user and the slaves periodicallysynchronize the configurations from the master. In this way, the entire fabric can operate with the sameconfigurations.DRRDRR is used to implement redundancy routing backup. The devices in a fabric run their independentrouting protocols and maintain their own routing tables. Unlike a common layer 3 switch, a fabricmember does not generate a layer 3 forwarding table to forward packets; instead, it uploads the routingtable to the master, which generates a forwarding table used by the entire fabric by integrating therouting tables of all the devices. Then each slave synchronizes this forwarding table from the masterand takes it as the basis for layer 3 forwarding.
